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|
module RSpec
module Matchers
module BuiltIn
# @api private
# Provides the implementation for `has_<predicate>`.
# Not intended to be instantiated directly.
class Has < BaseMatcher
def initialize(method_name, *args, &block)
@method_name, @args, @block = method_name, args, block
end
# @private
def matches?(actual, &block)
@actual = actual
@block ||= block
predicate_accessible? && predicate_matches?
end
# @private
def does_not_match?(actual, &block)
@actual = actual
@block ||= block
predicate_accessible? && !predicate_matches?
end
# @api private
# @return [String]
def failure_message
validity_message || "expected ##{predicate}#{failure_message_args_description} to return true, got false"
end
# @api private
# @return [String]
def failure_message_when_negated
validity_message || "expected ##{predicate}#{failure_message_args_description} to return false, got true"
end
# @api private
# @return [String]
def description
[method_description, args_description].compact.join(' ')
end
private
def predicate_accessible?
!private_predicate? && predicate_exists?
end
# support 1.8.7, evaluate once at load time for performance
if String === methods.first
# :nocov:
def private_predicate?
@actual.private_methods.include? predicate.to_s
end
# :nocov:
else
def private_predicate?
@actual.private_methods.include? predicate
end
end
def predicate_exists?
@actual.respond_to? predicate
end
def predicate_matches?
@actual.__send__(predicate, *@args, &@block)
end
def predicate
# On 1.9, there appears to be a bug where String#match can return `false`
# rather than the match data object. Changing to Regex#match appears to
# work around this bug. For an example of this bug, see:
# https://travis-ci.org/rspec/rspec-expectations/jobs/27549635
@predicate ||= :"has_#{Matchers::HAS_REGEX.match(@method_name.to_s).captures.first}?"
end
def method_description
@method_name.to_s.gsub('_', ' ')
end
def args_description
return nil if @args.empty?
@args.map { |arg| RSpec::Support::ObjectFormatter.format(arg) }.join(', ')
end
def failure_message_args_description
desc = args_description
"(#{desc})" if desc
end
def validity_message
if private_predicate?
"expected #{@actual} to respond to `#{predicate}` but `#{predicate}` is a private method"
elsif !predicate_exists?
"expected #{@actual} to respond to `#{predicate}`"
end
end
end
end
end
end
|
